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Operating Systems Linux Gentoo cpu%/mem% usage, scripting, dzen2: howto learn bash the hard way Post 302221819 by broli on Tuesday 5th of August 2008 09:18:29 AM
Old 08-05-2008
[QUOTE=era;302221664]Another couple of notes about the use of a temporary file.

First off, if you will never use the first few lines of the temp file, might as well throw them away already at the start.

Code:
top -b -n 1 | tail -n +8 > /tmp/salidatop

[quote]
i will use those lines to have the iddle% and the amount of memory
Quote:
Originally Posted by era
Secondly, when you are done, you should remove your temporary file. Better yet, remove it even if you are interrupted.

Code:
trap 'rm -f /tmp/salidatop; exit $?' 0
trap 'exit 127' 1 2 3 5 15

Put those lines near the beginning of the script.

Properly speaking, you should probably use something like mktemp to generate a unique, unpredictable temporary file name. There are security issues with using predictable names, and having a static file name means you can't run two instances of the script at the same time.
its by design.

about the security risk, i decided that beeing my personal laptop, always in a secure network, and only the contents of top, that is not thread enough to consider some extra precausions
also, my /tmp is wiped out on poweroff and poweron

the script needs X to run, and the script is run by my user config files (fluxbox startup), so there wont be any other instance.
but deniying the posibilitie is a bad idea.
maybe using $$ in some part of the file can do the trick
and adding the trap to make sure i dont left behind tons of temporal files.
 

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zipnote(1)						      General Commands Manual							zipnote(1)

NAME
zipnote - write the comments in zipfile to stdout, edit comments and rename files in zipfile SYNOPSIS
zipnote [-w] [-b path] [-h] [-v] [-L] zipfile ARGUMENTS
zipfile Zipfile to read comments from or edit. OPTIONS
-w Write comments to a zipfile from stdin (see below). -b path Use path for the temporary zip file. -h Show a short help. -v Show version information. -L Show software license. DESCRIPTION
zipnote writes the comments in a zipfile to stdout. This is the default mode. A second mode allows updating the comments in a zipfile as well as allows changing the names of the files in the zipfile. These modes are described below. EXAMPLES
To write all comments in a zipfile to stdout use for example zipnote foo.zip > foo.tmp This writes all comments in the zipfile foo.zip to the file foo.tmp in a specific format. If desired, this file can then be edited to change the comments and then used to update the zipfile. zipnote -w foo.zip < foo.tmp The names of the files in the zipfile can also be changed in this way. This is done by following lines like "@ name" in the created temporary file (called foo.tmp here) with lines like "@=newname" and then using the -w option as above. BUGS
The temporary file format is rather specific and zipnote is rather picky about it. It should be easier to change file names in a script. Does not yet support large (> 2 GB) or split archives. SEE ALSO
zip(1), unzip(1) AUTHOR
Info-ZIP v3.0 of 8 May 2008 zipnote(1)
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